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High-capacity porous spherical graphitized carbon negative electrode material and preparation method thereof

A technology of graphitized carbon and negative electrode materials, applied in battery electrodes, electrochemical generators, electrical components, etc., can solve the problems of low reversible capacity of first charge and discharge, unsuitable for high current charge and discharge, poor electrolyte compatibility, etc. Achieve excellent fluidity, reduce Coulomb loss and increase compaction density

Active Publication Date: 2016-10-12
内蒙古凯金新能源科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, graphite also has some disadvantages, such as poor compatibility with the electrolyte, low reversible capacity for the first charge and discharge, not suitable for high current charge and discharge, poor cycle performance, etc.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The preparation method of the high-capacity porous spherical graphitized carbon negative electrode material provided in this example includes further emulsifying the colloidal silica aqueous solution to obtain a nano-silica mixed emulsion, which is subjected to constant temperature condensation, water evaporation, self-assembly, washing, and calcination , to obtain a silica-like crystal sphere template, inject the precursor dispersion into the nanopore channel of the silica-like crystal sphere template, after ultrasonic impregnation, high-temperature calcination, removal of the template, and filtration and drying, a high-capacity porous spherical graphitized carbon anode material. Specific steps include:

[0027] Preparation of S1 silica gel crystal sphere template:

[0028] First, tetraethyl orthosilicate is added to the mixed solution of sodium hydroxide and alcoholic aqueous solution, stirred, and hydrolyzed to obtain a silica-like aqueous solution with a mass fract...

Embodiment 2

[0037] The high-capacity porous spherical graphitized carbon negative electrode material and its preparation method provided in this example differ from Example 1 in that its specific preparation steps include:

[0038] Preparation of S1 silica gel crystal sphere template:

[0039] First, tetraethyl orthosilicate is added to the mixed solution of potassium hydroxide and alcoholic aqueous solution, stirred, and hydrolyzed to obtain a silica-like aqueous solution with a mass fraction of 80 wt%, wherein the mass ratio of potassium hydroxide to alcoholic aqueous solution is 1 : 5; the volume ratio of alcohol to water in the alcohol solution is 1:3.

[0040]Then, mix colloidal silica aqueous solution, n-hexadecane, surfactant, and distilled water in a volume ratio of 5:2:1:20, stir magnetically for 35 minutes, and emulsify at a constant angular velocity to obtain nano-silica Mix the emulsion, and then condense it at a constant temperature of 35°C. After the water evaporates, the n...

Embodiment 3

[0049] The high-capacity porous spherical graphitized carbon negative electrode material and its preparation method provided in this example differ from Example 1 in that its specific preparation steps include:

[0050] Preparation of S1 silica gel crystal sphere template:

[0051] First, add tetraethyl orthosilicate into the mixed solution of ammonia water and alcohol aqueous solution, stir, and hydrolyze to obtain a silica-like aqueous solution with a mass fraction of 60 wt%, wherein the mass ratio of ammonia water to alcohol aqueous solution is 1:3; The volume ratio of alcohol to water in aqueous solution is 1:2.

[0052] Then, mix colloidal silica aqueous solution, n-hexadecane, surfactant, and distilled water in a volume ratio of 4:1:0.8:18, stir magnetically for 28 minutes, and emulsify at a constant angular velocity to obtain nano-silica Mix the emulsion, and then condense it at a constant temperature of 30°C. After the water evaporates, the nano-silica particles self-...

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Abstract

The invention belongs to the technical field of lithium ion battery negative electrode materials, and in particular relates to a preparation method for a high-capacity porous spherical graphitized carbon negative electrode material. The preparation method comprises the following steps: injecting a precursor dispersion liquid into nano pores of a silicon dioxide colloidal crystal spherical template; carrying out ultrasonic immersing, high-temperature calcinations, template removal, filtering and drying to obtain the high-capacity porous spherical graphitized carbon negative electrode material; and further emulsifying a colloidal silicon dioxide aqueous solution to obtain nano silicon dioxide mixed emulsion; and carrying out constant-temperature condensation, water evaporation, self-assembly, washing and calcinations on the nano silicon dioxide mixed emulsion to obtain the silicon dioxide colloidal crystal spherical template. The invention further discloses the high-capacity porous spherical graphitized carbon negative electrode material prepared by the method. The high-capacity porous spherical graphitized carbon negative electrode material is suitable for manufacturing an electrode material, an electrode plate and the like, can increase charging and discharging capacity of a battery, and is suitable for large-current charging and discharging; and compaction density of the electrode plate is increased, rebound of the electrode plate is reduced, and service life of the battery is prolonged.

Description

technical field [0001] The invention belongs to the technical field of composite materials, and in particular relates to a high-capacity porous spherical graphitized carbon negative electrode material and a preparation method thereof. Background technique [0002] As lithium-ion battery negative electrode materials, there are the following types: graphitized carbon materials, amorphous carbon materials, nitrides, silicon-based materials, tin-based materials, and new alloys. At present, commercial lithium-ion battery negative electrodes use graphitized carbon such as mesophase Carbon microspheres MCMB and CMsl materials. The volume expansion of this type of material during lithium intercalation and deintercalation is basically 9%-13%, which is suitable for lithium intercalation and deintercalation; the charge-discharge specific capacity can reach more than 300mAh / g, the charge-discharge efficiency is above 90%, and the irreversible capacity is less than 50mAh / g; The deinter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01M4/583H01M4/62H01M10/0525C01B31/04
CPCH01M4/583H01M4/625H01M10/0525Y02E60/10
Inventor 晏荦仰韻霖
Owner 内蒙古凯金新能源科技有限公司
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